Valve tappet



A 2 l l G. S. SALZMAN VALVE TAPPET Filed Oct. 3.

IN VEN TOR.

By 660591 dd ATTORNEYS Patented Nov. l T924.

enema s. sALzMAn. or CLEVELAND HEIGHTS, OHIO.

new mrrn'r.

Application filedOctober a, 1921. Serial No. 505,133.

To aZZ whom it may concern.

Be it known that I, Gron'en S- SALZMAN, a citizen of the United States,and a resident of Cleveland Heights, county of Cuyahoga, and State ofOhio, have invented a newand useful Improvement in Valve Tappets, ofwhich the following is a specification, the principle of the inventionbeing herein explained and the best mode in'- which I have contemplatedapplying that principle, soas to distinguish it from other inventions.

The present invention relating, as indicated to valve tappet, is moreparticularly directed to the provision of improved tappets and mountingor guide therefor which shall avoid the difficulties which have been metwith in the construction of valve tappets of the various types nowgenerally used in internal combustion engines. It has long been knownthat it is practically impossible to maintain all of the valve tappetsused in internal combustion en ines in proper alignment and in thedesire position which is, of course, at exact right angles to the camshaft. This difiiculty is caused by the very slight tipping of thetappet with respect to the surface of the cam, which operates thefollower portion of the tap et. This tipping or tilting of the tappet 1sdue either to an initial improper fit between tappets and the guidestherefor, or to wear on one or both of these parts. Even when thetappets and guides are held to the closest possible manufacturinglimits, it is not always possible to maintain the tappets in the desiredpositions with the resu t that the followers ride on one edge of thecam, wearing down the cam and cutting into the follower.

The present invention is designed to eliminate this difiiculty byproviding means which serve to maintain a constant and automaticalignment of the tappet with the cam. To

the accomplishment of the foregoing and re- 1 lated ends, saidinvention, then, consists of the means hereinafter fully described andparticularly pointed out in the claims.

The annexed drawing and the following description set forth in detailcertain mechanism embodying the invention, such disclosed meansconstituting, however, but one of various mechanical forms in which theprinciple of the invention may be used.

In said annexed drawing Fig. 1 is a transverse section through myimproved guide and tappet construction showing also the cam andfollower; Fig. 2

is aside elevation of the same; and Fig. 3 is a section through thetappet and push-rod.

In Fig. 1 I have shown the cam shaft 1 of an internal combustion enginewhich is provided with cams 2 and 2 of the usual construction. Operatedby cams 2-and 2 are valve tappets 3 and 3. The two tappets shown in Fig.2 are of the same construction and the description of one is sufficient.The tappet 3 actuates a push rod 4 whichhas a rounded or ball end 15engaging-in a socket- 16 in the lower end of the tappet, (see Fig. 3)and is slidably as well as rotatably mounted inan enclosing guide orhousing 5. This housing member 5 is provided with oppositelyprojectingstuds or-trunnions6 which are received in suitable bearings 7which may be conveniently formed half in the case 8 and half ina yokemember 9 which is mounted above the bearings and supported by means of abolt 10, projecting fromthe motor housing 12 on which are adjusting nuts11 which permit of convenient adjustment of the yoke member to take upthe bearings for the trunnions 6. The specific construction and mountingof the bearings for the trunnions on the guide 5 may obviously be variedin numerous ways, and separate bearings may be provided in collarsheldon the motor 12 in some cases.

The present tappet is permitted to tilt or oscillate about the axis A-Aextending through the center of the two trunnions 6. This axis is atright angles to the axis of the cam 2 so that if the tappet and followerbe come tilted with respect to the surface of the cam the pressure ofthe valve spring (not shown) rocks the tappet about the edge which is incontact with the cam until it rests in full flat engagement across thesurface of the cam. The present invention may readily be used andincorporated in connection with tappets of various types, either of themushroom type, as here shown, or of the crowned or roller tappets.

With the present construction it is unnecessary to work to the extremelyclose limits which have heretofore been maintained them to be selfaligning and to be pressed. automatically into a full line contact withthe surface of the cam.

Other modes of applying the principle of my invention may be employedinstead of the one explained, change being made as re ards the mechanismherein disclosed, provided the means stated by any of the followingclaims or the equivalent of such stated means be employed. v V a Itherefore particularly point out and distinctly claim as my invention 1.In mechanism of the character described, the combination of a cam shafthaving a cam thereon, a valve tappet-perpendicularly aligned with saidcam, a push rod having a rounded end engaged in a socket provided insaid valvetappet, and

' a guide for said tappet, saidv guidebeing pivotally mounted to permitangular adjustment of the tappet.

' J 2. In mechanism of the character deangles to'said shaft, tappetsmounted in said guides and bearing against saidcams, push rods engagingrounded sockets provided in said tappets, and a yoke engaging both ofsaid guides and maintaining the same in said housing.

3. In mechanism of the character de scribed, the combination of a camshaft having a cam thereon, a valve tappet in alignment with said cam,and guiding means for said tappet adapted to permit automatic angularmovement of said tappet, whereby said tappet may be kept inperpendicular alignment with the surface of said cam.

4. In mechanism of the character described, the combination of a camshaft having a cam thereon, a push rod mounted perpendicularly to theaxis of said shaft, and a valve tappet mounted between said push rod andsaid cam, said tappet being angularly adjustable with respect to bothsaid rod and said cam.

5. In mechanism of the character described, the combination of a camshaft having a. cam thereon, a valve tappet aligned with said cam, apush rod actuated by said tappet, said tappet and said rod beingangularly adjustable with respect to each other, and a pivotally mountedguide for said tappet adapted to permit angular movement of said tappetwith respect to the longitudinal axis of said shaft.

GEORGE S. SALZMAN.

